[clutter/clutter-1.22] gdk: Use RGBA visual if there is one

[Emmanuele Bassi <ebassi src gnome org>]

commit 8cf629d4c1d2f4020bb3d9c3d70e4d26959052bb
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu May 7 13:26:37 2015 +0100

    gdk: Use RGBA visual if there is one
    
    The condition check for the has_rgba_visual flag is reversed, and thus
    we relied on drivers returning an ARGB visual first by default.
    
    Referenced by: https://bugzilla.redhat.com/show_bug.cgi?id=1206960
    
    (cherry picked from commit 8fc8a73580ceb810ee7f34eae0df26fac4cb277d)
    
    Signed-off-by: Emmanuele Bassi <ebassi gnome org>

 clutter/gdk/clutter-backend-gdk.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/clutter/gdk/clutter-backend-gdk.c b/clutter/gdk/clutter-backend-gdk.c
index 5b88d32..b4f7f1c 100644
--- a/clutter/gdk/clutter-backend-gdk.c
+++ b/clutter/gdk/clutter-backend-gdk.c
@@ -334,7 +334,8 @@ clutter_backend_gdk_get_display (ClutterBackend  *backend,
   gboolean has_rgba_visual;
   gboolean res;
 
-  has_rgba_visual = gdk_screen_get_rgba_visual (backend_gdk->screen) == NULL;
+  /* We default to an RGBA visual if there is one */
+  has_rgba_visual = gdk_screen_get_rgba_visual (backend_gdk->screen) != NULL;
 
   CLUTTER_NOTE (BACKEND, "Alpha on Cogl swap chain: %s",
                 has_rgba_visual ? "enabled" : "disabled");